docs: def remove_child(self, child):
          '''Remove child from ``Node`` object
  
          Args:
              ``child`` (``Node``): The child to remove
          '''
          if not isinstance(child, Node):
              raise TypeError("child must be a Node")
          try:
              self.children.remove(child); child.parent = None
          except:
              raise RuntimeError("Attempting to remove non-existent child")